Electroscope and charging device therefor



Sept. 28 1926.

L "lllllllll" 1,601,042 F. ROSA ELECTROSCOPE' AND GHARGI NG DEVICE THEREFOR Filed Dec. 28 1923 Bwenfir F HOSQ/ Patented Sept. 28, 1926. I I V T UNITED STATES PATENT OFFICE.

FERDINANDO ROSA, OF MILAN, ITALY.

ELECTROSCOPE AND CHARGING DEVICE THEREFOR.

Application filed December 28, 1923, Serial No. 683,244, and in Italy March 10, 1923.

The present invention relates to a small strol es of the arm 6 the electric charge sized easily portable electroscope of the socan be adjusted so as to obtain a greater called gold leaf type, in which the leaf of or smaller deviation of the leaf 8-. gold or of some other metal, for instance To the other arm of the double-arm 5 aluminium, capable of replacing it, is dilever is attached one end of the return verged when an electric charge is imparted spring 9, the other end of which is fixed to it. at -ll, the purpose of this spring being The invention essentially consists in the to bring the arm 10 back to its rest pofact that in the electroscope a device is emsition as soon as the arm -6- is released.

10 bodied adapted to impart to it an electric Opposite the leaf 3- is arranged in the charge most quickly and through a simple ordinary way the plate 1.2- serving to manoeuverperformed by hand without risk press the leaf 3 against the bar -1 of rupturing and spoiling the leaf of gold and thus protect it when the apparatus is or of any other material susceptible of benot in use; this plate can be moved back- 15 ing affected by the charge, the said device wards and forwards, being yet maintained consisting in a brush carried by a pivotal parallel to the bar 1, by operating the member which can be suitably swung in knob -18 of the rod l9- by which the such a way that the brush rugs against a plate 12 is carried. The plate l2- metal ball lagged with insulating material side facing the leaf -3- is coated with a 20 and arranged opposite one face of the gold layer of insulating paint -16, so that leaf when the latter is in its rest position. When the leaf -3 is charged While the The spirit of the invention will be readiplate 12- is away from it, the leaf 3, ly understood on reference to the accomif it is made to reach the plate 12 as panying drawing, which is a cross section can be obtained by imparting to the electo- 7.

2-? through the apparatus forming the subject scope a charge of suiiicient intensity, rematter of the invention in one of its execumains adherent to the said plate and in neartion forms that has been chosen by way of ly horizontal position and maintains this l position until the electrosoope is discharged.

As may be seen from the drawing, the The apparatus is completed by a stem 0 so improved electroscope at issue comprises a 20 ending at the top in a knob 1etvertical bar 1, to one face of which is and capable of being revolved in a sleeve secured at 2 the metal leaf 3; to 2l. From the bottom end of the stem the opposite face of the said bar is fixed a 20 is suspended the bar 1 so that metal ball 5- coated with suitable in the latter can be turned when, for instance, 5

35 sulating material, for instance gum lac. On it is desired to inspect the leaf -3-.

a pivot 7, supported in the end walls The electroscope just described, being of the apparatus box or casing -15, readily portable and permitting of being swings a double-arm lever 610--, to easily and quickly charged lends itself quite the hub of which the brush -8 is secured. well to the industrial investigation of the By suitably operating the lever arm -6-, electric conductivity of certain bodies and which extends to the outside across a slot substances, the said conductivity affording a -1'T cut in the casing -15-, the brush basis on which in many cases a judgment 8 can be rubbed against the ball 5-. can be formed as to the quality of the body It is just this rubbing that imparts the elecor substance at issue, for instance in the teX- e5 tric charge to the apparatus; a few strokes tile trade, in the industry of insulating mateof the arm -6 suffice to electrify the ball rials etc.

5 as well as the leaf -3. The leaf Of course the constructional and form then moves from the position indicated in details may be varied in actual practice from full lines to the position indicated by dotted those shown and described within the spirit 1 0 lines in the drawing. and scope of the invention.

Of course by varying the number of Having now particularly described and ascertained the nature of my said invention and in What form the same can be performed, I declare that What I claim is:

In combination With a portable electroscope of the leaf type, a device adapted to quickly impart an electric charge to the eiectroscope, said device including a metallie ball arranged laterally of the electroscopeleaf when the latter is in rest position, a.

coating of insulating material on the ball a 10 ROSA FERDINANDO. 

